I use it very often. It is the best dictionary a learner can buy. I want to spread a word of it to all listeners by having recorded a short review of it.
Our personal experience
We first saw the CCED (the 2nd edition) in 1999, when only the paper version was available. We immediately felt it was something special. Normally, we use only software dictionaries, but we started using the paper COBUILD dictionary, because we liked the contents so much.
Today, we still like learning with the dictionary very much. When we need to look up a word, it helps us understand it and use it in our own sentences. Often, we look up one word, and then we feel like reading another one — the definitions and examples are so nice. Sometimes, we even like to read the CCED just like a book.
Conclusions
When you look up a word in a dictionary, you should be interested in what the word means. But you should also ask the question "What can I do with it?". The CCED answers this question very well by giving the most important phrases and grammar structures containing the word — both in the definition and example sentences.
Together, the definition and the example sentences give you an almost complete picture of how a word is used in the English language. After you read them, the word is usually "yours" — you can use it easily in your own sentences.